JPH0586222A - Method for treating inner surface of tube-like film - Google Patents

Abstract

PURPOSE:To stably, uniformly and beautifully treat the inner surface of a tubular film, while holding the reasonable productivity by treating the outer circumferential surface of the tubular film with a chemical agent solution, cutting the treated tubular film in a prescribed length and subsequently turning over the cut tubular film by the utilization of a jig. CONSTITUTION:A long flat tubular film 2 is drawn out, and the circumferential surface of the produced tubular film is continuously treated with a chemical agent solution in a chemical agent tank 3 containing the chemical agent solution 4 comprising the liquid ammonia solution of sodium metal, etc. The film 2 is cut into a prescribed length and subsequently turned over preferably by the use of a column-like tube jig 10 on which surface molding bars 13 having adhesive layers and capable of being embedded in the cross section of the column main body are disposed, thereby stably and uniformly applying a chemical agent treatment to the inner surface of the tubular film.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of treating an inner surface of a tubular film with a chemical solution in order to improve the adhesiveness of a fluororesin tube.

[0002]

2. Description of the Related Art For example, fluororesin tubes are used in various fields because they have many excellent physical and chemical properties, heat resistance, chemical resistance, non-adhesiveness, etc. In combination with, it is difficult to form a simple adhesive composite due to its non-adhesiveness.Therefore, it is better to perform various etching treatments such as treating the surface of the fluororesin molded product with an alkali metal solution than before. It is possible to apply the agent. In particular, recently, the liquid ammonia method has been reconsidered in which treatment is carried out using a liquid in which metallic sodium is dissolved in liquid ammonia, because of the necessity of improving the heat resistance and durability of the surface-treated surface of the fluororesin tube. In the case of this method, it was difficult to stably and continuously perform the inner surface treatment of the tube because the treatment liquid was significantly deteriorated.

[0003]

That is, in order to treat the inner surface of the tube, as shown in FIG. 7, a tube-shaped film 20 which has been folded into two in a long flat shape and wound into a roll is drawn out as shown in FIG. The chemical solution 23 was injected into the inner surface of the tubular film between the pair of pinch rolls 21 and 22 for continuous treatment. However, in this method, the chemical solution is treated because the potency of the chemical solution decreases as the treatment progresses. However, there is a problem in that it is easy to make variations to the extent of the above, and in order to prevent deterioration of the chemical liquid, even continuous treatment must be performed in a small lot (for example, a length of 5 m) and productivity is poor.

In order to solve the above problems, the object of the present invention is to provide a method capable of maintaining reasonable productivity,
It is an object of the present invention to provide a treatment method capable of maintaining the deterioration of a chemical solution within a range allowed for chemical solution treatment and stably and uniformly treating the inner surface of a tubular film.

[0005]

In order to solve the above-mentioned problems, the invention of claim 1 is a method for treating the inner surface of a tubular film with a chemical solution, which comprises drawing a long flat tubular film and The outer peripheral surface is continuously treated with a chemical solution,
It is characterized in that it is cut into a predetermined length and the tubular film is turned inside out.

According to a second aspect of the present invention, when the tubular film is turned upside down, it can be immersed in the column main rest in a transverse section, and a cylindrical tube treatment provided with a molding bar having an adhesive layer on its surface in the axial direction. It is characterized by using ingredients.

The tubular film, like a fluororesin tube, has excellent chemical resistance and a small surface friction coefficient and excellent releasability of toner and the like. A cylindrical plastic film or the like that is used by closely covering the outer peripheral surface and has a thickness of 30 to 30.
0 μ is preferable, and more preferably 50 to 150 μ.
However, the present invention is not limited to such a value, and any tubular film that can be turned upside down by the tube jig on the cylinder is applicable to the present invention. The fluorine resin is mainly a tetrafluoride resin, for example, tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer (PFA), tetrafluoroethylene / hexafluoropropylene copolymer (FEP), ethylene / tetrafluoroethylene. Copolymers (ETFE), polytetrafluoroethylene (TFE) and the like are widely used because they have many excellent physical and chemical properties. However, there is no problem if an organic polymer material other than the above-mentioned fluororesin is used.

The chemical treatment in the present invention is particularly a treatment such as a liquid ammonia method in which metallic sodium is dissolved in liquid ammonia for treatment in order to improve heat resistance and durability of a surface-treated surface of a fluororesin tube or the like. Immersion treatment or the like using a chemical liquid that is significantly deteriorated is particularly effective, but this is not particularly limited, and the present invention can be applied to any chemical liquid treatment. As a preferred example of the treatment liquid, a uniform ammonia-sodium solution is prepared by adding 0.1 to 5% by weight of metallic sodium to liquid ammonia at a temperature lower than its boiling point (for example, -60 ° C) and stirring the mixture sufficiently. I can give you. Of course, the temperature, the amount of metallic sodium added, the method for preparing the solution, and the like are not particularly limited.

The predetermined length for cutting the tubular film of the present invention is not particularly limited, but is preferably 100 to 1500 mm, more preferably 350.
A value of about 650 mm can be exemplified. At this time, when the tubular film is turned inside out using a cylindrical tube jig, the length of the tubular film corresponds to the length of the tube jig (the finished dimension of the tubular film is It is desirable that the length is smaller than the length), but this is not particularly limited.

The pressure-sensitive adhesive layer of the molding bar having a pressure-sensitive adhesive layer on the surface according to claim 2 of the present invention may be, for example, a double-sided tape attached, but shows adhesiveness to a fluororesin tube or the like. The adhesive may be applied to the outer surface of the molding bar, as long as it has a holding force that does not cause any misalignment with the tube jig when the fluororesin tube or the like is turned inside out.

[0011]

[Function] When the inner surface of the tubular film is treated with the chemical solution, the outer peripheral surface is continuously treated with the chemical solution in the chemical solution tank, cut into a predetermined length and turned over, so that the chemical solution in the chemical solution tank is rational. Since it becomes possible to supply a sufficient amount to maintain the productivity, it is possible to prevent the potency of the drug solution from decreasing.

When the tubular film is turned inside out, a cylindrical tube jig having an adhesive property on the surface is used, so that the tubular film is held evenly around the entire circumference and is not folded back so that wrinkles and streaks do not occur. Beautifully turned inside out.

[0013]

Embodiments will be described below with reference to the drawings.

As shown in FIG. 1, a fluororesin PFA tube wound around a 50 m core (thickness 70 μ, diameter 30)
mm) 1 is pulled out by the pinch roll 5 via the guide rollers 6, 6, 6 and continuously immersed in the chemical solution 4 in the chemical solution tank 3 during traveling to treat the outer peripheral surface of the tube with the chemical solution, and then alcohol, water The tubes were sequentially washed (not shown), and cut into a predetermined length with a cutter 7 to obtain a tubular film 2 whose outer peripheral surface was stably and uniformly treated with a chemical solution.

At this time, 1 liter of the chemical liquid 4 consisting of a liquid ammonia solution of metal sodium (1% by weight) was placed in the chemical liquid tank 3, and the treatment was carried out while continuously stirring using a magnetic stirrer. This chemical liquid 4 is filled with a sufficient amount of liquid for treating the outer peripheral surface of the entire length of the tube or metallic sodium is excessively supplied to the chemical liquid tank 3 so that the titer of the liquid is reinforced as the chemical liquid deteriorates. The processing power is maintained by any of the following methods.

Next, as shown in FIG. 2, the corners 8, 8 at one end of the tubular film 2 (folded into two in a flat shape) are cut. The dimensions of the corner portions 8 and 8 are more preferable if they can be clamped by the clamps 17 and 17 shown in FIG.

FIG. 3 shows a state in which the tubular film 2 is inserted into the cylindrical tube jig 10. Same jig 10
Is a columnar main body 11 and a cutout groove 1 provided in the main body 11.
2 and 12 are loosely fitted and are connected to air cylinders 15 and 15 fixed to the base portion of the main body 11 through metal fittings 14 and 14 so that they can be inserted into the notch grooves 12 and 12 in the cross section of the main body 11. It is made possible by forming bars 13, 13. Adhesive double-sided tapes 18, 18 are attached to the outer peripheral surfaces of the bars 13, 13. Further, springs 16 and 16 are fitted to the tips of the molding bars 13 and 13 to assist the actuation of the bars 13 and 13 by the air cylinders 15 and 15. The tip of the cylindrical body 11 is preferably formed in a conical shape, but is not limited to this.
A chamfer having a large size, a semicircular shape, or the like may be appropriately used.

In order to insert the tubular film 2 into the cylindrical tube jig 10, as shown in FIG. 3, the tongues 9 and 9 of the film 2 are clamped and opened by the two clamps 17 and 17 to open the cylindrical film. The main body 11 is inserted from the tip in the direction of arrow a. At this time, the molding bars 13 and 13 are attached to the air cylinder 1.
The film 2 is easily inserted into the tube jig 10 because the film 2 is sunk into the cutout grooves 12 and 12 of the main body 11 by the operation of 5 and 15 in the direction of arrow B.

When the insertion of the film 2 is completed, the air cylinders 15 and 15 operate in the direction of arrow C as shown in FIG. 4, and the columnar main body 11 is held by the molding bars 13 and 13 so that the outer circumference of the cylindrical body 11 is a perfect circle. Molded bar 1
Double-sided tape 1 on the surface where 3 and 13 are in contact with the film 2
The tube jig 10 and the film 2 are held by 8 and 18 with a constant holding force suitable for the inside out operation described below.

Next, as shown in FIG. 5, the clamps 17, 1
The tongues 9 and 9 are turned upside down by turning the respective 7 toward the outside, and the clamps 17 and 17 are fixed to the cylindrical body 1
By moving in the direction of arrow D away from 1, the tubular film 2 is continuously turned over beautifully over the entire circumference without wrinkles or streaks.

As shown in FIG. 6, the tubular film 2 which has been turned upside down is re-cut at the end portion including the tongues 9 and 9 so that the inner surface of the tubular film 2 is stably and uniformly treated with the chemical solution. Becomes That is, the portion treated with the chemical solution is located on the inner surface of the film 2.

The tubular film 2 in this embodiment
Is a fluororesin PFA tube (thickness 70μ, diameter 3
However, in the method of the present invention, any material can be applied as long as it is a tubular film which can be turned inside out by a tube jig, and is not particularly limited.

Further, in the inside-out operation of the tubular film 2 using the tube jig 10, the operator may manually perform the operation of moving the clamps 17 while the jig 10 is fixed to the work table. Or a series of cutting, inside out,
It may be an automatic inside-out device that automates each recutting operation.

[0024]

EFFECTS OF THE INVENTION Since the present invention is configured as described above, when the inner surface of the tubular film is treated with a chemical solution, the productivity is kept reasonable and the deterioration of the chemical solution is kept within the range permitted for the chemical treatment. In addition to the above, there is a special effect that the inner surface treatment can be performed stably and uniformly and beautifully.

[0025]

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a chemical solution treatment according to the method of the present invention.

FIG. 2 is an explanatory view of a tubular film in the method of the present invention.

FIG. 3 is an explanatory view of inserting a tubular film into a tubular jig in the method of the present invention.

FIG. 4 is an explanatory view showing a state in which a tubular film is inserted through a tubular jig in the method of the present invention.

FIG. 5 is an explanatory view showing a state in which the tubular film is turned inside out by the tubular jig in the method of the present invention.

FIG. 6 is an explanatory view showing a re-cutting state of the tubular film in the method of the present invention.

FIG. 7 is an explanatory diagram showing a state of inner surface chemical liquid treatment of a tubular film in a conventional method.

[Explanation of symbols]

 2 Tube film 3 Chemical tank 10 Tube jig 13 Molding bar

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuo Sekoshi No. 1 Hirano, Murakuno, Konan City, Aichi Prefecture Gunze Co., Ltd. Development Engineering Department Engineering Plastics Business Center

Claims (2)

[Claims] 1. A method for treating an inner surface of a tubular film with a chemical solution, which comprises pulling out a long flat tubular film, continuously treating the outer peripheral surface with the chemical solution in a chemical solution tank, and cutting the film into a predetermined length. A method for treating the inner surface of a tubular film, which comprises inverting the tubular film 2. When the tube-shaped film is turned inside out, a columnar tube jig is used, which is immersible in the columnar body in a transverse section and has a molding bar having an adhesive layer on the surface in the axial direction. The method for treating the inner surface of a tubular film according to claim 1.